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[S390] s390: move machine flags to lowcore

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Currently the storage of the machine flags is a globally exported unsigned
long long variable. By moving the storage location into the lowcore struct we
allow assembler code to check machine_flags directly even without needing a
register. Addtionally the lowcore and therefore the machine flags too will be
in cache most of the time.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Ehrhardt
2009-04-14 15:36:16 +02:00
committed by Martin Schwidefsky
parent b21597d026
commit 25097bf153
10 changed files with 56 additions and 36 deletions
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4
arch/s390/kernel/setup.c
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@@ -82,9 +82,6 @@ EXPORT_SYMBOL(console_devno);
unsigned int console_irq = -1;
EXPORT_SYMBOL(console_irq);
unsigned long machine_flags;
EXPORT_SYMBOL(machine_flags);
unsigned long elf_hwcap = 0;
char elf_platform[ELF_PLATFORM_SIZE];
@@ -426,6 +423,7 @@ setup_lowcore(void)
__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
lc->current_task = (unsigned long) init_thread_union.thread_info.task;
lc->thread_info = (unsigned long) &init_thread_union;
lc->machine_flags = S390_lowcore.machine_flags;
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
lc->extended_save_area_addr = (__u32)